This specification prescribes requirements for the classification of shielding gases. Gases may be supplied in either gaseous or liquid form@ but when used in welding@ the shielding is always in the gaseous form. Gas shielded arc welding processes include@ but are not limited to: manual@ semiautomatic@ mechanized@ and automatic gas tungsten arc welding (GTAW)@ gas metal arc welding (GMAW)@ flux cored arc welding (FCAW)@ electrogas welding (EGW)@ and plasma arc welding (PAW).